Shielding gas

About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.

Grain refinement control in tig arc welding

Abstract: A method for controlling grain size and weld puddle agitation in a tungsten electrode inert gas welding system to produce fine, even grain size and distribution is disclosed In the method the frequency of DC welding voltage pulses supplied to the welding electrode is varied over a preselected frequency range and the arc gas voltage is monitored At some frequency in the preselected range the arc gas voltage will pass through a maximum By maintaining the operating frequency of the system at this value, maximum weld puddle agitation and fine grain structure are produced

Investigation of microstructure and mechanical properties of GTAW and GMAW joints on AA7075 aluminum alloy

Abstract: Aluminum and its alloys have been used extensively due to their light weight, moderate strength and good corrosion resistance. Aluminium alloy 7075 has been researched upon especially as a potential candidate for aircraft material. This alloy is difficult to weld using conventional welding techniques like GMAW and GTAW. An attempt has been made in this investigation to weld 7075 alloy using GTAW and GMAW with argon as a shielding gas. Mechanical properties of the joint like tensile strength, Hardness and impact strength have been tested and reported. Microstructural characterization has been done using standard metallography. SEM micrographs have also been taken to study the fracture characteristics.

Consumable welding rod for welding chromium steels and the resultant welds

Abstract: The consumable welding rods contain titanium and niobium in amounts such that a weld formed by melting the rod contains titanium niobium in an amount corresponding to the expression 2Ti+ Nb (6-14)C wherein Ti, Nb and C are the proportion of titanium, niobium and carbon in said weld metal. The proportion of titanium and niobium in the welding rod is determined by estimating the total quantity of carbon in the weld metal, the quantities of carbon, titanium and niobium lost by oxidation during welding and the variations in the quantities of titanium and niobium in the weld metal resulting from the welding process.

Welding torch with gas flow control

Abstract: An arc system is described which includes a power generator, a shielding gas source, a torch and a shielding gas monitor contained adjacent to or within the torch. The torch is connected to the power generator for producing an arc with a workpiece, is connected to the shielding gas source for providing shielding gas to an arc locations, and includes a flow sensor mounted within or adjacent the torch body for monitoring the flow of shielding gas through the torch and optimally providing feedback control of the shielding gas flow.

Welding gas shield control

Abstract: An inert gas is supplied in a conduit system at a pressure high enough to provide a desired shielding gas volume at each and all arc welding sites spread over a substantial work area and each welder is responsible for the performance of a lightweight, readily portable, security protected, fixed pressure output regulator of high accuracy preferably having a pressure gauge and two independent visible output flow meters and flow valves easily adjusted separately to provide proper shielding at the front and back of a weld simultaneously, but independently, under the personal control of each welder at each welding site with excellent mobility regardless of floor elevation, for an acceptable and individualized responsibility for each certified weld performed.